Abstract
Galvanic corrosion of AZ31B joined with bare or Zn-coated DP590 steel by ultrasonic spot welding or linear friction stir welding was quantitatively studied by pre-defining anode and cathode in the lap joint samples. Corrosion volume and depth from Mg anode surfaces exposed to 0.1 M sodium chloride solution was analyzed as functions of cathode surface type and welding method. Characterization of as-welded joints was performed to identify any microstructural feature of the bonding zone that could impact galvanic corrosion behavior. COMSOL modeling with modified user subroutine was conducted to simulate the progression of Mg corrosion in the same joint and electrode configurations used for the corrosion experiments. The experimental results indicated that Zn-coated cathode surface can reduce Mg galvanic corrosion significantly as galvanic polarization and cathodic current on Zn-coated surface remained relatively low for Mg in the weld joints. COMSOL modeling described the growth of Mg galvanic corrosion in a reasonable manner but showed limitation by underestimating the corrosion volume as it did not capture self-corrosion.
| Original language | English |
|---|---|
| Pages (from-to) | 462-479 |
| Number of pages | 18 |
| Journal | Journal of Magnesium and Alloys |
| Volume | 11 |
| Issue number | 2 |
| DOIs | |
| State | Published - Feb 2023 |
Funding
This research was funded by the U.S. Department Energy's Vehicle Technology Offices as a part of the Joining Core Program. The authors appreciate leadership, guidance, and technical support from ORNL technical reviewers, Rich Davies and John Wade at ORNL and Darrell Herling and Glenn Grant at PNNL. This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan). This research was funded by the U.S. Department Energy's Vehicle Technology Offices as a part of the Joining Core Program. The authors appreciate leadership, guidance, and technical support from ORNL technical reviewers, Rich Davies and John Wade at ORNL and Darrell Herling and Glenn Grant at PNNL. This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE) . The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ).
| Funders | Funder number |
|---|---|
| DOE Public Access Plan | |
| United States Government | |
| U.S. Department of Energy | |
| Oak Ridge National Laboratory | |
| Pacific Northwest National Laboratory | DE-AC05-00OR22725 |
Keywords
- Friction stir welding
- Galvanic corrosion
- Mg alloy
- Ultrasonic spot welding
- Zn coating